EP3170673A1 - Digital printing method for ceramic colours - Google Patents

Digital printing method for ceramic colours Download PDF

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Publication number
EP3170673A1
EP3170673A1 EP16198615.3A EP16198615A EP3170673A1 EP 3170673 A1 EP3170673 A1 EP 3170673A1 EP 16198615 A EP16198615 A EP 16198615A EP 3170673 A1 EP3170673 A1 EP 3170673A1
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EP
European Patent Office
Prior art keywords
ceramic
substrate
paint
laser beam
ceramic paint
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16198615.3A
Other languages
German (de)
French (fr)
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EP3170673B1 (en
Inventor
Günther WAIBEL
Lokman Altan
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Hochschule Offenburg
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Hochschule Offenburg
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Publication of EP3170673A1 publication Critical patent/EP3170673A1/en
Application granted granted Critical
Publication of EP3170673B1 publication Critical patent/EP3170673B1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/447Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources
    • B41J2/455Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources using laser arrays, the laser array being smaller than the medium to be recorded
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0015Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
    • B41J11/002Curing or drying the ink on the copy materials, e.g. by heating or irradiating
    • B41J11/0021Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/475Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material for heating selectively by radiation or ultrasonic waves
    • B41J2/48Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material for heating selectively by radiation or ultrasonic waves melting ink on a film or melting ink granules
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0011Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0023Digital printing methods characterised by the inks used
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041Digital printing on surfaces other than ordinary paper
    • B41M5/0047Digital printing on surfaces other than ordinary paper by ink-jet printing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041Digital printing on surfaces other than ordinary paper
    • B41M5/0058Digital printing on surfaces other than ordinary paper on metals and oxidised metal surfaces
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041Digital printing on surfaces other than ordinary paper
    • B41M5/007Digital printing on surfaces other than ordinary paper on glass, ceramic, tiles, concrete, stones, etc.
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/22Surface treatment of glass, not in the form of fibres or filaments, by coating with other inorganic material
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2218/00Methods for coating glass
    • C03C2218/10Deposition methods
    • C03C2218/11Deposition methods from solutions or suspensions
    • C03C2218/119Deposition methods from solutions or suspensions by printing

Definitions

  • the present invention relates to a method of digitally printing a ceramic paint on a substrate, wherein the ceramic of the ceramic paint is heated to at least the melting point of the ceramic by means of a laser beam simultaneously with the application of the ceramic paint to a substrate by means of a print head.
  • the present invention also relates to the use of a laser beam in an apparatus for digitally printing a ceramic paint on a substrate, wherein the laser beam heats the ceramic of the ceramic paint to at least the melting point of the ceramic simultaneously with the application of the ceramic paint to a substrate by means of a print head of the apparatus ,
  • the present invention also relates to an apparatus for digitally printing a ceramic paint on a substrate comprising a print head for applying a ceramic paint to a substrate and a laser for heating the ceramic of the ceramic paint to at least the melting point of the ceramic by means of a laser beam.
  • the screen printing technology has its advantages in larger runs of identical motifs (series production), while the digital printing technology has its strength in smaller runs to custom-made.
  • screen printing was considered superior to digital printing in terms of print quality.
  • increasingly faster availability and greater flexibility are in demand on the market.
  • the quality of new UV digital printing presses almost matches the result of screen printing.
  • Corresponding digital printing machines are available, for example, from the company Thieme (www.thieme-products.de) or Fa. Durst (www.durst-online.com).
  • the second major differentiator is the print medium, the color. While in the screen printing sector so far mainly worked with UV-curable organic-based inks, increasingly ceramic colors are used nowadays.
  • Ceramic paints have been screen-printed for some time now and are now also available on the market in digital printing. However, all inks have one thing in common: To cure the ceramic paint, it is always necessary to subsequently stain the paint on the substrate.
  • the big problem with currently used ceramic paints is the high melting temperature that is required for curing (about 600 ° C to 1400 ° C, depending on the color mixture / composition). So far, no method is known which can cure ceramic inks on the printhead synchronously with the ink application.
  • the subsequent color curing takes place both in screen printing and in digital printing usually in a so-called tempering furnace at temperatures above 600 ° C.
  • subsequent color curing in an oven also entails the disadvantage that the substrate to be printed on must be stable at the temperatures required for color curing.
  • the present invention also relates to a process for producing a printed substrate in which the aforementioned steps (a) and (b) are performed and also take place simultaneously with each other. All the preferred embodiments mentioned herein for the method according to the invention for digital printing apply equally to the method for producing a printed substrate.
  • step (b) of heating the ceramic is carried out simultaneously on the same substrate on which the step (a) of applying the ceramic paint is carried out. This does not mean that step (b) must be performed at the same location as step (a), but this may be the case.
  • devices may be used as digital printing devices, as known to those skilled in the art from the state of the art, with the proviso that these devices are combined with a laser capable of performing step (b) of the method of the invention.
  • Corresponding digital printing devices are available, for example, from Fa. Lungier, Thieme (www.thieme-products.de) or Fa. Durst (www.durst-online.com), for example the Longier Performer FG3750 from Lungier or the Rho Vetrocer Models 160, 250 or 330 of the company Durst.
  • digital printing is meant a group of printing processes in which the print image is transferred directly from a computer to a printing press without the use of a static printing form.
  • the substrate to which the ceramic paint is applied is preferably a substrate that is temperature stable at temperatures up to 2000 ° C, more preferably 1000 ° C, and most preferably 800 ° C.
  • the substrate may be a metal, ceramic or glass substrate.
  • ceramics all technical ceramics can be used.
  • the metal is preferably steel into consideration.
  • the substrate is preferably a glass substrate, and any conceivable glasses having a sufficiently high temperature stability can be used. Examples include float glass and laminated safety glass.
  • the ceramic paint is preferably a paint in which ceramic pigments are suspended / dispersed in a solvent.
  • the ceramic paint is a suspension / dispersion of ceramic pigments in a solvent.
  • Such ceramic colors are known as ceramic inks.
  • the ceramic paint may also contain other additives in addition to the ceramic pigments and the solvent, such as inorganic glass frits and dispersing and carrier liquids.
  • a ceramic color also called ceramic ink
  • inorganic thirst Rho Vetrocer ceramic ink from the company Durst.
  • the ceramic paints used according to the invention contain no radiation-curing additives, since the curing should not take place with the aid of these radiation-curing additives, but rather by melting the ceramic pigments and then curing them again by cooling.
  • the ceramic pigments are particularly preferably intended to bond to the substrate by melting the substrate surface or the substrate material on the substrate surface, in particular glass, during the melting of the ceramic pigments. Ceramic pigments which can be used according to the invention are described, for example, in US Pat EP 0 768 343 A2 described.
  • Ceramic pigments all ceramic pigments are conceivable which are meltable at temperatures in the range of 500 ° C to 3200 ° C, more preferably 600 ° C to 2700 ° C, and most preferably 600 ° C to 2000 ° C, ie their melting temperatures in the specified Areas lie.
  • Ceramic pigments which can be used according to the invention are, for example, inorganic silicates, titanates, oxides, carbides or nitrides, for example the metals Si, Al, Zr, Be, Ba, B or Ti.
  • the average particle size of the ceramic pigments in the ceramic paint is preferably in the range of 0.005 mm to 0.1 mm, more preferably in the range of 0.005 mm to 0.05 mm.
  • step (b) of the process according to the invention the ceramic or ceramic pigments of the ceramic paint is heated to temperatures ranging from 550 ° C to 3200 ° C, more preferably from 600 ° C to 2000 ° C, and most preferably from 600 ° C to 1500 ° C heated.
  • the substrate with the applied ceramic paint is allowed to cool to room temperature, whereby the ceramic cures and forms a printed surface on the substrate.
  • the heating of the ceramic of the ceramic color is carried out by means of a laser beam which heats the ceramic of the applied ceramic color focused on the substrate in one point.
  • the laser is focused to a desired point at a certain temperature at which the ceramic pigments of the ceramic paint are to be melted.
  • the one-point focused heating preferably takes place in the range of 100 fs to 1 ⁇ s, more preferably in the range of 1 ps to 10 ns.
  • the point at which the laser beam is focused to heat the ceramic preferably has a diameter in the range of 0.1 ⁇ m to 15 mm, more preferably 0.05 mm to 10 mm. Furthermore, it is preferred that the heating of the ceramic of the ceramic color by means of a laser beam by pulsed laser irradiation takes place. In other words, a pulsed laser beam is preferably used.
  • the single pulse of laser radiation is preferably in the range of 0.5 ps to 10 ns, more preferably in the range of 1 ps to 5 ns.
  • the pulse frequency is preferably in the range of 1 Hz to 1000 Hz.
  • the use of pulsed laser irradiation has the advantage according to the invention that although the relatively short ceramic pigments can be heated to their melting temperature due to the short duration of the pulse, the substrate is affected by these larger temperatures spatial Expansion is not suspended. Due to the short irradiation time, the energy can be better distributed in the substrate, so that damage to the substrate, for example by cracking, can be prevented. In this way, with the method according to the invention, it is also possible to melt ceramic pigments whose melting temperature is above the melting temperature of the substrate.
  • the laser beam for heating the ceramic of the ceramic paint may be irradiated from the same side of the substrate on which the ceramic paint is applied.
  • the laser beam for heating the ceramics of the ceramics color is irradiated from the side of the substrate opposite to the side on which the ceramics paint is applied, i. the laser beam is focused through the substrate to the point where the ceramic to be fused is located.
  • the substrate be made of a transparent material, e.g. Glass exists. In this way, in contrast to the radiation from the side on which the ceramic paint is applied, also the glass on the surface to which the ceramic paint is applied, be melted. This can lead to a homogeneous connection of the ceramic of the ceramic color and the substrate surface.
  • it is also advantageous to use a pulsed laser beam since in this way the irradiation time can be shortened, so that the laser beam on the way through the substrate this not - for example, by cracking - damaged.
  • step (b) of the method according to the invention takes place in that the ceramic color is effected by irradiation of two laser beams, wherein a first laser beam heats the ceramic and a second laser beam melts the substrate surface.
  • the first laser beam is irradiated from the side of the substrate on which the ceramic is applied, and a second laser beam is irradiated from the side of the substrate opposite to the side where the ceramic is applied .
  • the connection between ceramic and substrate is particularly homogeneous.
  • the irradiation of only the side on which the ceramic paint is applied is often not sufficient to melt the substrate surface, to ensure a homogeneous connection between ceramic and substrate. It is particularly preferred according to the invention that the first and the second laser beam are irradiated substantially simultaneously.
  • the ceramic pigments or the ceramic of the ceramic paint can be heated even before the impact of the substrate, i. on the way from the printhead of the digital printing device to the substrate so that the ceramic pigments already impinge on the substrate in molten form.
  • the ceramic pigments can also be heated to their melting point only when they are already on the substrate.
  • Possible usable laser sources are, for example, CO 2 lasers, Nd: YAG lasers, excimer lasers or a diode laser.
  • the laser power is preferably in the range of 10 W to 500 W, more preferably in the range of 20 W to 100 W.
  • the pulse energy of the laser is preferably in the range of 10 mJ to 1000 mJ, more preferably in the range of 200 mJ to 600 mJ .
  • the wavelength of the laser depends on the type of laser used and can be at an excimer laser at 193 nm, 248 nm, 308 nm or 351 nm, with a CO 2 laser at 10.6 microns or 9.4 microns, and with an Nd: YAG laser at 1064 nm, 946 nm, 1320 nm or 1444 nm.
  • UV range wavelengths in the range of 150 nm to 355 nm and in the near IR range wavelengths of 5 ⁇ m to 11 ⁇ m are preferred according to the invention.
  • the inventive method further allows due to a rapid energy modulation by temperature effects, the variation of the color composition or the color values according to the so-called RAL color table.
  • the radiation source or the laser for heating the ceramic paint in the print head can be integrated be.
  • the ceramic pigments or ceramic colors required for the production of colors according to the RAL table can be provided in a tank system.
  • a suitable control electronics for "intelligent" color mixing in the color management system is preferably used.
  • Another object of the present invention is the use of a laser beam or a laser in an apparatus for digitally printing a ceramic paint on a substrate, wherein the laser beam, the ceramic of the ceramic paint on at least the melting point of the ceramic simultaneously with the application of the ceramic paint to a substrate by means of a Printhead heated to the device.
  • Yet another object of the present invention is an apparatus for digitally printing a ceramic paint on a substrate comprising a printhead for applying a ceramic paint to a substrate and a laser for heating the ceramic of the ceramic paint to at least the melting point of the ceramic by means of a laser beam.
  • this has a first and a second laser, which - as described above - can serve to irradiate the first and the second laser beam.
  • Fig. 1 3 shows schematically how ceramic pigments 2 of a ceramic color 2 are applied to a substrate 1, which are treated simultaneously with a laser beam of a laser 4, so that the pigments can melt and be cured by subsequent cooling.
  • a method according to the invention is shown in which applied to a substrate 1 ceramic pigments 3 of a ceramic paint 2 at a certain location on the substrate 1.
  • the heating of the applied ceramic pigments 3 takes place on the same substrate 1 at the same time by the laser beam of a laser 4, but not at the same point at which the ceramic paint 2 is applied to the substrate 1.
  • a printed surface 5 can be formed on the glass substrate 1.
  • Fig. 3 shows a method according to the invention, in which ceramic pigments 3 of a ceramic paint 2 are applied to a substrate 1 from one side.
  • the laser beam is focused in such a way that its focal point is not in the substrate 1, but only at the point at which the ceramic pigments 3 of the ceramic paint 2 to be melted. Again through Cooling of the ceramic pigments produces here a printed surface 5 on the substrate 1.
  • a glass substrate is preferably used.
  • Fig. 4 shows a method according to the invention, in which on a substrate 1 ceramic pigments 3 of a ceramic paint 2 are applied, which are melted directly at the point where they are applied to the print head by the laser beam of a laser 4. By cooling the ceramic pigments 3 on the substrate 1, a printed surface 5 is formed.
  • Fig. 5 schematically shows a method according to the invention, in which the laser 4 is integrated in the printhead of the digital printing device, so that the ceramic pigments 3 of the ceramic paint 2 are heated to their melting temperature during application to the substrate 1. Again, by cooling the ceramic pigments 3, a printed surface 5 is formed on the substrate 1.
  • Fig. 6 schematically shows a method according to the invention, in which two different lasers 4 are irradiated.
  • the first laser 4 is preferably used to melt the ceramic 3 in the ceramic paint 2. This laser is preferably located on the side from which the ceramic paint 2 is applied to the substrate 1.
  • the second laser 4 is preferably used to melt the substrate 1 on the surface at which the ceramic paint 2 is applied.
  • the latter laser 4 preferably radiates from the side opposite to the side from which the ceramic paint 2 is applied.
  • Fig. 7 a method according to the prior art shown in which a substrate 1 is first printed with ceramic pigments 3 and only after the printing process, the melting and curing of the ceramic pigments 3 takes place in a tempering furnace 6. Only after the removal of the printed substrate 1 from the tempering furnace 6 does the cooling of the molten ceramic pigments allow the formation of a printed surface 5.

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Abstract

Die vorliegende Erfindung betrifft ein Verfahren zum digitalen Drucken einer Keramikfarbe auf einem Substrat, wobei die Keramik der Keramikfarbe auf mindestens den Schmelzpunkt der Keramik mittels eines Laserstrahls simultan zu dem Aufbringen der Keramikfarbe auf ein Substrat mittels eines Druckkopfes erwärmt wird. Weiterhin betrifft die vorliegende Erfindung auch die Verwendung eines Laserstrahls in einer Vorrichtung zum digitalen Drucken einer Keramikfarbe auf einem Substrat, wobei der Laserstrahl die Keramik der Keramikfarbe auf mindestens den Schmelzpunkt der Keramik simultan zu dem Aufbringen der Keramikfarbe auf ein Substrat mittels eines Druckkopfes der Vorrichtung erwärmt. Die vorliegende Erfindung betrifft weiterhin auch eine Vorrichtung zum digitalen Drucken einer Keramikfarbe auf einem Substrat, die einen Druckkopf zum Aufbringen einer Keramikfarbe auf ein Substrat sowie einen Laser zum Erwärmen der Keramik der Keramikfarbe auf mindestens den Schmelzpunkt der Keramik mittels eines Laserstrahls umfasst.The present invention relates to a method of digitally printing a ceramic paint on a substrate, wherein the ceramic of the ceramic paint is heated to at least the melting point of the ceramic by means of a laser beam simultaneously with the application of the ceramic paint to a substrate by means of a print head. Furthermore, the present invention also relates to the use of a laser beam in an apparatus for digitally printing a ceramic paint on a substrate, wherein the laser beam heats the ceramic of the ceramic paint to at least the melting point of the ceramic simultaneously with the application of the ceramic paint to a substrate by means of a print head of the apparatus , The present invention also relates to an apparatus for digitally printing a ceramic paint on a substrate comprising a print head for applying a ceramic paint to a substrate and a laser for heating the ceramic of the ceramic paint to at least the melting point of the ceramic by means of a laser beam.

Description

Die vorliegende Erfindung betrifft ein Verfahren zum digitalen Drucken einer Keramikfarbe auf einem Substrat, wobei die Keramik der Keramikfarbe auf mindestens den Schmelzpunkt der Keramik mittels eines Laserstrahls simultan zu dem Aufbringen der Keramikfarbe auf ein Substrat mittels eines Druckkopfes erwärmt wird. Weiterhin betrifft die vorliegende Erfindung auch die Verwendung eines Laserstrahls in einer Vorrichtung zum digitalen Drucken einer Keramikfarbe auf einem Substrat, wobei der Laserstrahl die Keramik der Keramikfarbe auf mindestens den Schmelzpunkt der Keramik simultan zu dem Aufbringen der Keramikfarbe auf ein Substrat mittels eines Druckkopfes der Vorrichtung erwärmt. Die vorliegende Erfindung betrifft weiterhin auch eine Vorrichtung zum digitalen Drucken einer Keramikfarbe auf einem Substrat, die einen Druckkopf zum Aufbringen einer Keramikfarbe auf ein Substrat sowie einen Laser zum Erwärmen der Keramik der Keramikfarbe auf mindestens den Schmelzpunkt der Keramik mittels eines Laserstrahls umfasst.The present invention relates to a method of digitally printing a ceramic paint on a substrate, wherein the ceramic of the ceramic paint is heated to at least the melting point of the ceramic by means of a laser beam simultaneously with the application of the ceramic paint to a substrate by means of a print head. Furthermore, the present invention also relates to the use of a laser beam in an apparatus for digitally printing a ceramic paint on a substrate, wherein the laser beam heats the ceramic of the ceramic paint to at least the melting point of the ceramic simultaneously with the application of the ceramic paint to a substrate by means of a print head of the apparatus , The present invention also relates to an apparatus for digitally printing a ceramic paint on a substrate comprising a print head for applying a ceramic paint to a substrate and a laser for heating the ceramic of the ceramic paint to at least the melting point of the ceramic by means of a laser beam.

Bei heutigen Druckverfahren sind prinzipiell zwei Hauptmerkmale zu unterscheiden, zum einen die Bedruckungstechnik, zum anderen das Druckmedium (Farbe). Als Bedruckungstechnik hat sich Digitaldruck auf Glas mittlerweile neben Walzendruck und Spritzen als Industriestandard etabliert. Im Gegensatz zur Siebdrucktechnik ist die Digitaldrucktechnik sehr viel flexibler und als "rapid-prototyping-Verfahren" wesentlich schneller verfügbar. Während beim Siebdruck ein aufwändiger Prozess von der Siebherstellung über den eigentlichen Druck bis zur anschließenden Aushärtung der Farben durchlaufen werden muss, liegt beim Digitaldruck das Druckergebnis meist am gleichen Tag vor, da je nach Druckkopftechnologie die Farbe direkt auf das Substrat aufgetragen wird und diese nach kurzer Zeit selbstständig aushärtet (z.B. durch UV-Härtung oder IR-Strahlung). Die Siebdrucktechnik hat ihre Vorteile bei größeren Auflagen identischer Motive (Serienproduktion), während die Digitaldrucktechnik ihre Stärke bei kleineren Auflagen bis hin zu Einzelanfertigungen hat. Bislang galt der Siebdruck in Bezug auf Druckqualität dem Digitaldruck als überlegen. Allerdings ist am Markt zunehmend schnellere Verfügbarkeit und höhere Flexibilität gefragt, zudem reicht die Qualität durch neue UV-Digitaldruckmaschinen nahezu an das Ergebnis des Siebdrucks heran. Entsprechende Digitaldruckmaschinen sind beispielsweise bei der Fa. Thieme (www.thieme-products.de) oder Fa. Durst (www.durst-online.com) erhältlich. Das zweite Hauptunterscheidungsmerkmal ist das Druckmedium, die Farbe. Während im Siebdruckbereich bislang hauptsächlich mit UV-härtenden Tinten auf organischer Basis gearbeitet wurde, kommen in letzter Zeit zunehmend keramische Farben zum Einsatz. Der größte Vorteil von Keramikfarben ist die hohe mechanische Festigkeit, die insbesondere im Industriebereich in Verbindung mit Glas zunehmend gefordert wird. Hintergrund ist die erforderliche Langzeitstabilität bei Produkten, die eine Bedienoberfläche aus Glas aufweisen und in rauer Umgebung mit wechselnden Temperaturen eingesetzt werden (z.B. Displays, Smartphones, Bedienelemente...). Keramikfarben können seit längerem im Siebdruck verarbeitet werden und sind mittlerweile auch im Digitaldruck am Markt verfügbar. Alle Druckfarben haben diesbezüglich jedoch eines gemeinsam: Zur Aushärtung der Keramikfarbe ist immer ein anschließendes Einbrennen der Farbe auf dem Substrat erforderlich.In today's printing processes, two main features have to be distinguished, on the one hand the printing technique and on the other hand the printing medium (color). As a printing technology, digital printing on glass has meanwhile established itself as an industry standard in addition to roller printing and spraying. In contrast to screen printing technology, digital printing technology is much more flexible and much faster available as a "rapid prototyping process" . While screen printing requires a complex process, from screen production to actual printing and subsequent curing of the colors, digital printing usually produces the same result the same day, as the ink is applied directly to the substrate, depending on the printhead technology, and after a short time Self-curing time (eg by UV curing or IR radiation). The screen printing technology has its advantages in larger runs of identical motifs (series production), while the digital printing technology has its strength in smaller runs to custom-made. Previously, screen printing was considered superior to digital printing in terms of print quality. However, increasingly faster availability and greater flexibility are in demand on the market. In addition, the quality of new UV digital printing presses almost matches the result of screen printing. Corresponding digital printing machines are available, for example, from the company Thieme (www.thieme-products.de) or Fa. Durst (www.durst-online.com). The second major differentiator is the print medium, the color. While in the screen printing sector so far mainly worked with UV-curable organic-based inks, increasingly ceramic colors are used lately. The biggest advantage of ceramic paints is the high mechanical strength, which is increasingly required in the industrial sector in connection with glass. The background is the required long-term stability for products that have a glass user interface and are used in harsh environments with changing temperatures (eg displays, smartphones, operating elements ...). Ceramic paints have been screen-printed for some time now and are now also available on the market in digital printing. However, all inks have one thing in common: To cure the ceramic paint, it is always necessary to subsequently stain the paint on the substrate.

Das große Problem bei derzeit verwendeten Keramikfarben ist die hohe Schmelztemperatur, die zur Aushärtung erforderlich ist (ca. 600°C bis 1400°C, je nach Farbmischung/-zusammensetzung). Bislang ist kein Verfahren bekannt, das Keramikfarben bereits am Druckkopf synchron zur Farbaufbringung aushärten kann. Die anschließende Farbaushärtung erfolgt sowohl beim Siebdruck als auch beim Digitaldruck in der Regel in einem sogenannten Vorspannofen bei Temperaturen über 600°C. Weiterhin bringt eine anschließende Farbaushärtung in einem Ofen auch den Nachteil mit sich, dass das Substrat, auf das aufgedruckt wird, bei den für die Farbaushärtung erforderlichen Temperaturen stabil sein muss.The big problem with currently used ceramic paints is the high melting temperature that is required for curing (about 600 ° C to 1400 ° C, depending on the color mixture / composition). So far, no method is known which can cure ceramic inks on the printhead synchronously with the ink application. The subsequent color curing takes place both in screen printing and in digital printing usually in a so-called tempering furnace at temperatures above 600 ° C. Furthermore, subsequent color curing in an oven also entails the disadvantage that the substrate to be printed on must be stable at the temperatures required for color curing.

Es war deshalb die Aufgabe der vorliegenden Erfindung, ein Verfahren, beziehungsweise eine Vorrichtung zum Digitaldruck von Keramikfarben bereitzustellen, mit dem die bisher relativ lange Prozesszeit und die geringe Flexibilität verbessert werden kann, beziehungsweise auch Keramikfarben verwendet werden können, deren Schmelzpunkte oberhalb der Schmelzpunkte des Substrats, auf das sie aufgebracht werden, liegen.It was therefore an object of the present invention to provide a method or a device for digital printing of ceramic paints, with which the previously relatively long process time and low flexibility can be improved, or ceramic paints can be used, whose melting points above the melting point of the substrate to which they are applied, lie.

Zur Lösung der genannten Aufgabe stellt die vorliegende Erfindung ein Verfahren zum digitalen Drucken einer Keramikfarbe auf einem Substrat bereit, das die folgenden Schritte umfasst:

  1. (a) Aufbringen einer Keramikfarbe auf ein Substrat mittels eines Druckkopfes eines Digitaldruckgerätes; und
  2. (b) Erwärmen der Keramikfarbe auf mindestens den Schmelzpunkt der Keramik mittels eines Laserstrahls,
dadurch gekennzeichnet, dass der Schritt (b) simultan zu dem Schritt (a) stattfindet.To achieve the stated object, the present invention provides a method for digitally printing a ceramic paint on a substrate, comprising the following steps:
  1. (a) applying a ceramic paint to a substrate by means of a print head of a digital printing apparatus; and
  2. (b) heating the ceramic paint to at least the melting point of the ceramic by means of a laser beam,
characterized in that step (b) takes place simultaneously with step (a).

Alternativ betrifft die vorliegende Erfindung auch ein Verfahren zur Herstellung eines bedruckten Substrats, bei dem die zuvor genannten Schritte (a) und (b) durchgeführt werden und ebenso simultan zueinander stattfinden. Alle hierin genannten bevorzugten Ausführungsformen für das erfindungsgemäße Verfahren zum digitalen Drucken gelten gleichermaßen für das Verfahren zur Herstellung eines bedruckten Substrats.Alternatively, the present invention also relates to a process for producing a printed substrate in which the aforementioned steps (a) and (b) are performed and also take place simultaneously with each other. All the preferred embodiments mentioned herein for the method according to the invention for digital printing apply equally to the method for producing a printed substrate.

Unter dem Begriff "simultan" wird in der vorliegenden Erfindung verstanden, dass der Schritt (b) des Erwärmens der Keramik zeitgleich an dem gleichen Substrat durchgeführt wird, an dem auch der Schritt (a) des Aufbringens der Keramikfarbe durchgeführt wird. Das heißt nicht, dass der Schritt (b) ortsgleich zu dem Schritt (a) durchgeführt werden muss, jedoch kann dies auch der Fall sein.The term "simultaneous" in the present invention means that the step (b) of heating the ceramic is carried out simultaneously on the same substrate on which the step (a) of applying the ceramic paint is carried out. This does not mean that step (b) must be performed at the same location as step (a), but this may be the case.

Als Digitaldruckgeräte können beispielsweise Geräte genommen werden, wie sie dem Fachmann in diesem Gebiet aus dem Stand der Technik bekannt sind, mit der Maßgabe, dass diese Geräte mit einem Laser kombiniert werden, der den Schritt (b) des erfindungsgemäßen Verfahrens durchführen kann. Entsprechende Digitaldruckgeräte sind beispielsweise bei der Fa. Longier, Fa. Thieme (www.thieme-products.de) oder Fa. Durst (www.durst-online.com) erhältlich, beispielsweise der Longier Performer FG3750 der Fa. Longier oder die Rho Vetrocer Modelle 160, 250 oder 330 der Fa. Durst.For example, devices may be used as digital printing devices, as known to those skilled in the art from the state of the art, with the proviso that these devices are combined with a laser capable of performing step (b) of the method of the invention. Corresponding digital printing devices are available, for example, from Fa. Lungier, Thieme (www.thieme-products.de) or Fa. Durst (www.durst-online.com), for example the Longier Performer FG3750 from Lungier or the Rho Vetrocer Models 160, 250 or 330 of the company Durst.

Unter "DigitaldrucK" wird eine Gruppe von Druckverfahren verstanden, bei denen das Druckbild direkt von einem Computer in eine Druckmaschine übertragen wird, ohne dass eine statische Druckform benutzt wird.By "digital printing" is meant a group of printing processes in which the print image is transferred directly from a computer to a printing press without the use of a static printing form.

Das Substrat, auf das die Keramikfarbe aufgebracht wird, ist vorzugsweise ein Substrat, das bei Temperaturen bis zu 2000°C, stärker bevorzugt 1000°C und am stärksten bevorzugt 800°C temperaturstabil ist. Das Substrat kann ein Metall-, Keramik- oder Glassubstrat sein. Als Keramiken können alle technischen Keramiken verwendet werden. Als Metall kommt vorzugsweise Stahl in Betracht. Das Substrat ist jedoch vorzugsweise ein Glassubstrat, wobei alle denkbaren Gläser verwendet werden können, die eine ausreichend hohe Temperaturstabilität haben. Beispiele hierfür sind Floatglas und Verbundsicherheitsglas.The substrate to which the ceramic paint is applied is preferably a substrate that is temperature stable at temperatures up to 2000 ° C, more preferably 1000 ° C, and most preferably 800 ° C. The substrate may be a metal, ceramic or glass substrate. As ceramics, all technical ceramics can be used. As the metal is preferably steel into consideration. However, the substrate is preferably a glass substrate, and any conceivable glasses having a sufficiently high temperature stability can be used. Examples include float glass and laminated safety glass.

Die Keramikfarbe ist vorzugsweise eine Farbe, bei der Keramikpigmente suspendiert/dispergiert in einem Lösungsmittel vorliegen. In anderen Worten ist die Keramikfarbe eine Suspension/Dispersion von Keramikpigmenten in einem Lösungsmittel. Bekannt sind solche Keramikfarben als Keramiktinten. Die Keramikfarbe kann auch neben den Keramikpigmenten und dem Lösungsmittel weitere Zusatzstoffe enthalten, wie beispielsweise anorganische Glas-Fritten sowie Dispergier- und Trägerflüssigkeiten. Als Keramikfarbe (auch Keramiktinte genannt) kann erfindungsgemäß beispielsweise anorganische Durst Rho Vetrocer Keramiktinte der Fa. Durst verwendet werden. Es ist jedoch bevorzugt, dass die Keramikfarben, die erfindungsgemäß verwendet werden, keine strahlungshärtenden Zusatzstoffe enthalten, da die Aushärtung nicht mithilfe dieser strahlungshärtenden Zusatzstoffe erfolgen soll, sondern indem die Keramikpigmente aufgeschmolzen und anschließend durch Abkühlung wieder ausgehärtet werden. Besonders bevorzugt sollen die Keramikpigmente sich mit dem Substrat verbinden, indem es während dem Aufschmelzen der Keramikpigmente auch zu einem Aufschmelzen der Substratoberfläche bzw. des Substratmaterials an der Substratoberfläche, insbesondere Glas, kommt. Erfindungsgemäß verwendbare Keramikpigmente werden beispielsweise in der EP 0 768 343 A2 beschrieben.The ceramic paint is preferably a paint in which ceramic pigments are suspended / dispersed in a solvent. In other words, the ceramic paint is a suspension / dispersion of ceramic pigments in a solvent. Such ceramic colors are known as ceramic inks. The ceramic paint may also contain other additives in addition to the ceramic pigments and the solvent, such as inorganic glass frits and dispersing and carrier liquids. As a ceramic color (also called ceramic ink) can be used according to the invention, for example, inorganic thirst Rho Vetrocer ceramic ink from the company Durst. However, it is preferred that the ceramic paints used according to the invention contain no radiation-curing additives, since the curing should not take place with the aid of these radiation-curing additives, but rather by melting the ceramic pigments and then curing them again by cooling. The ceramic pigments are particularly preferably intended to bond to the substrate by melting the substrate surface or the substrate material on the substrate surface, in particular glass, during the melting of the ceramic pigments. Ceramic pigments which can be used according to the invention are described, for example, in US Pat EP 0 768 343 A2 described.

Als Keramikpigmente sind alle Keramikpigmente denkbar, die bei Temperaturen im Bereich von 500°C bis 3200°C, stärker bevorzugt 600°C bis 2700°C und am stärksten bevorzugt 600°C bis 2000°C aufschmelzbar sind, d.h. deren Schmelztemperaturen in den angegebenen Bereichen liegen. Erfindungsgemäß verwendbare Keramikpigmente sind beispielsweise anorganische Silikate, Titanate, Oxide, Carbide oder Nitride, beispielsweise der Metalle Si, Al, Zr, Be, Ba, B oder Ti.As ceramic pigments, all ceramic pigments are conceivable which are meltable at temperatures in the range of 500 ° C to 3200 ° C, more preferably 600 ° C to 2700 ° C, and most preferably 600 ° C to 2000 ° C, ie their melting temperatures in the specified Areas lie. Ceramic pigments which can be used according to the invention are, for example, inorganic silicates, titanates, oxides, carbides or nitrides, for example the metals Si, Al, Zr, Be, Ba, B or Ti.

Die mittlere Teilchengröße der Keramikpigmente in der Keramikfarbe liegt vorzugsweise im Bereich von 0,005 mm bis 0,1 mm, stärker bevorzugt im Bereich von 0,005 mm bis 0,05 mm.The average particle size of the ceramic pigments in the ceramic paint is preferably in the range of 0.005 mm to 0.1 mm, more preferably in the range of 0.005 mm to 0.05 mm.

In Schritt (b) des erfindungsgemäßen Verfahrens wird die Keramik, beziehungsweise die Keramikpigmente der Keramikfarbe auf Temperaturen im Bereich von 550°C bis 3200°C, stärker bevorzugt 600°C bis 2000°C und am stärksten bevorzugt 600°C bis 1500°C erwärmt.In step (b) of the process according to the invention, the ceramic or ceramic pigments of the ceramic paint is heated to temperatures ranging from 550 ° C to 3200 ° C, more preferably from 600 ° C to 2000 ° C, and most preferably from 600 ° C to 1500 ° C heated.

Nach den Schritten (a) und (b) erlaubt man dem Substrat mit der aufgebrachten Keramikfarbe auf Raumtemperatur abzukühlen, wobei die Keramik aushärtet und eine bedruckte Fläche auf dem Substrat bildet.After steps (a) and (b), the substrate with the applied ceramic paint is allowed to cool to room temperature, whereby the ceramic cures and forms a printed surface on the substrate.

In dem erfindungsgemäßen Verfahren ist es bevorzugt, dass das Erwärmen der Keramik der Keramikfarbe mittels eines Laserstrahls durchgeführt wird, der die Keramik der aufgebrachten Keramikfarbe auf dem Substrat in einem Punkt fokussiert erwärmt. In anderen Worten wird der Laser auf einen gewünschten Punkt mit einer bestimmten Temperatur fokussiert, an dem die Keramikpigmente der Keramikfarbe geschmolzen werden sollen.In the method according to the invention, it is preferable that the heating of the ceramic of the ceramic color is carried out by means of a laser beam which heats the ceramic of the applied ceramic color focused on the substrate in one point. In other words, the laser is focused to a desired point at a certain temperature at which the ceramic pigments of the ceramic paint are to be melted.

Das in einem Punkt fokussierte Erwärmen findet vorzugsweise mit einer Zeitdauer im Bereich von 100 fs bis 1 µs, noch stärker bevorzugt im Bereich von 1 ps bis 10 ns statt.The one-point focused heating preferably takes place in the range of 100 fs to 1 μs, more preferably in the range of 1 ps to 10 ns.

Der Punkt, auf den der Laserstrahl zum Erwärmen der Keramik fokussiert wird, weist vorzugsweise einen Durchmesser im Bereich von 0,1 µm bis 15 mm, stärker bevorzugt 0,05 mm bis 10 mm auf. Weiterhin ist es bevorzugt, dass das Erwärmen der Keramik der Keramikfarbe mittels eines Laserstrahls durch pulsierte Lasereinstrahlung stattfindet. In anderen Worten wird vorzugsweise ein pulsierter Laserstrahl verwendet. Der einzelne Puls der Lasereinstrahlung liegt hier vorzugsweise im Bereich von 0,5 ps bis 10 ns, stärker bevorzugt im Bereich von 1 ps bis 5 ns. Die Pulsfrequenz liegt vorzugsweise im Bereich von 1 Hz bis 1000 Hz. Die Verwendung von pulsierter Lasereinstrahlung hat erfindungsgemäß den Vorteil, dass durch die geringe Zeitdauer des Pulses zwar die relativ kleinen Keramikpigmente auf ihre Schmelztemperatur erwärmt werden können, das Substrat jedoch diesen Temperaturen durch seine größere räumliche Ausdehnung nicht ausgesetzt wird. Durch die kurze Einstrahlungsdauer kann die Energie besser im Substrat verteilt werden, so dass eine Beschädigung des Substrats, beispielsweise durch Rissbildung, verhindert werden kann. Auf diese Weise können mit dem erfindungsgemäßen Verfahren auch Keramikpigmente geschmolzen werden, deren Schmelztemperatur oberhalb der Schmelztemperatur des Substrats liegt.The point at which the laser beam is focused to heat the ceramic preferably has a diameter in the range of 0.1 μm to 15 mm, more preferably 0.05 mm to 10 mm. Furthermore, it is preferred that the heating of the ceramic of the ceramic color by means of a laser beam by pulsed laser irradiation takes place. In other words, a pulsed laser beam is preferably used. The single pulse of laser radiation is preferably in the range of 0.5 ps to 10 ns, more preferably in the range of 1 ps to 5 ns. The pulse frequency is preferably in the range of 1 Hz to 1000 Hz. The use of pulsed laser irradiation has the advantage according to the invention that although the relatively short ceramic pigments can be heated to their melting temperature due to the short duration of the pulse, the substrate is affected by these larger temperatures spatial Expansion is not suspended. Due to the short irradiation time, the energy can be better distributed in the substrate, so that damage to the substrate, for example by cracking, can be prevented. In this way, with the method according to the invention, it is also possible to melt ceramic pigments whose melting temperature is above the melting temperature of the substrate.

Der Laserstrahl zum Erwärmen der Keramik der Keramikfarbe kann von der gleichen Seite des Substrats eingestrahlt werden, auf der die Keramikfarbe aufgebracht wird. Besonders bevorzugt ist es jedoch, dass der Laserstrahl zum Erwärmen der Keramik der Keramikfarbe von der Seite des Substrats eingestrahlt wird, die der Seite gegenüber liegt, auf der die Keramikfarbe aufgebracht wird, d.h. der Laserstrahl wird durch das Substrat hindurch auf den Punkt fokussiert, an dem sich die zu schmelzende Keramik befindet. Hierbei ist es bevorzugt, dass das Substrat aus einem transparenten Material, z.B. Glas besteht. Auf diese Weise kann im Gegensatz zur Einstrahlung von der Seite, auf der die Keramikfarbe aufgebracht wird, auch das Glas an der Oberfläche, auf die die Keramikfarbe aufgebracht wird, zum Schmelzen gebracht werden. Damit kann es zu einer homogenen Verbindung der Keramik der Keramikfarbe und der Substratoberfläche kommen. Hier ist es auch vorteilhaft, einen pulsierten Laserstrahl zu verwenden, da auf diese Weise die Einstrahlungsdauer verkürzt werden kann, so dass der Laserstrahl auf dem Weg durch das Substrat dieses nicht - beispielsweise durch Rissbildung - beschädigt.The laser beam for heating the ceramic of the ceramic paint may be irradiated from the same side of the substrate on which the ceramic paint is applied. However, it is particularly preferable that the laser beam for heating the ceramics of the ceramics color is irradiated from the side of the substrate opposite to the side on which the ceramics paint is applied, i. the laser beam is focused through the substrate to the point where the ceramic to be fused is located. Here it is preferred that the substrate be made of a transparent material, e.g. Glass exists. In this way, in contrast to the radiation from the side on which the ceramic paint is applied, also the glass on the surface to which the ceramic paint is applied, be melted. This can lead to a homogeneous connection of the ceramic of the ceramic color and the substrate surface. Here it is also advantageous to use a pulsed laser beam, since in this way the irradiation time can be shortened, so that the laser beam on the way through the substrate this not - for example, by cracking - damaged.

In einer weiteren Ausführungsform der vorliegenden Erfindung erfolgt der Schritt (b) des erfindungsgemäßen Verfahrens dadurch, dass die Keramikfarbe durch Einstrahlen zweier Laserstrahlen erfolgt, wobei ein erster Laserstrahl die Keramik erwärmt und ein zweiter Laserstrahl die Substratoberfläche aufschmilzt. Hierbei ist es bevorzugt, wenn der erste Laserstrahl von der Seite des Substrats, auf der die Keramik aufgebracht wird, eingestrahlt wird, und ein zweiter Laserstrahl von der Seite des Substrats eingestrahlt wird, die sich der Seite gegenüber befindet, auf der die Keramik aufgebracht wird. Dies hat den Vorteil, dass mit dem ersten Laserstrahl die Keramik in der Keramikfarbe und mit dem zweiten Laserstrahl die Substratoberfläche geschmolzen werden kann. In dieser Ausführungsform ist die Verbindung zwischen Keramik und Substrat besonders homogen. Die Einstrahlung von nur der Seite, auf der die Keramikfarbe aufgebracht wird, reicht oft nicht aus, um auch die Substratoberfläche zu schmelzen, um eine homogene Verbindung zwischen Keramik und Substrat zu gewährleisten. Besonders bevorzugt ist es erfindungsgemäß, dass der erste und der zweite Laserstrahl im Wesentlichen zeitgleich eingestrahlt werden.In a further embodiment of the present invention, step (b) of the method according to the invention takes place in that the ceramic color is effected by irradiation of two laser beams, wherein a first laser beam heats the ceramic and a second laser beam melts the substrate surface. Here, it is preferable that the first laser beam is irradiated from the side of the substrate on which the ceramic is applied, and a second laser beam is irradiated from the side of the substrate opposite to the side where the ceramic is applied , This has the advantage that with the first laser beam the ceramic in the ceramic color and with the second laser beam, the substrate surface can be melted. In this embodiment, the connection between ceramic and substrate is particularly homogeneous. The irradiation of only the side on which the ceramic paint is applied is often not sufficient to melt the substrate surface, to ensure a homogeneous connection between ceramic and substrate. It is particularly preferred according to the invention that the first and the second laser beam are irradiated substantially simultaneously.

Die Keramikpigmente beziehungsweise die Keramik der Keramikfarbe können schon vor dem Auftreffen des Substrats erwärmt werden, d.h. auf dem Weg von dem Druckkopf des Digitaldruckgerätes zu dem Substrat, so dass die Keramikpigmente bereits in geschmolzener Form auf dem Substrat auftreffen.The ceramic pigments or the ceramic of the ceramic paint can be heated even before the impact of the substrate, i. on the way from the printhead of the digital printing device to the substrate so that the ceramic pigments already impinge on the substrate in molten form.

Weiterhin können die Keramikpigmente jedoch auch erst bis zu ihrem Schmelzpunkt erwärmt werden, wenn sie sich bereits auf dem Substrat befinden.However, the ceramic pigments can also be heated to their melting point only when they are already on the substrate.

Mögliche verwendbare Laserquellen sind beispielsweise CO2-Laser, Nd:YAG-Laser, Excimer-Laser oder ein Diodenlaser. Dabei liegt die Laserleistung vorzugsweise im Bereich von 10 W bis 500 W, stärker bevorzugt im Bereich von 20 W bis 100 W. Die Pulsenergie des Lasers liegt vorzugsweise im Bereich von 10 mJ bis 1000 mJ , stärker bevorzugt im Bereich von 200 mJ bis 600 mJ. Die Wellenlänge des Lasers hängt von der Art des verwendeten Lasers ab und kann bei einem Excimer-Laser bei 193 nm, 248 nm, 308 nm oder 351 nm, bei einem CO2-Laser bei 10,6 µm oder 9,4 µm, und bei einem Nd:YAG-Laser bei 1064 nm, 946 nm, 1320 nm oder 1444 nm liegen.Possible usable laser sources are, for example, CO 2 lasers, Nd: YAG lasers, excimer lasers or a diode laser. The laser power is preferably in the range of 10 W to 500 W, more preferably in the range of 20 W to 100 W. The pulse energy of the laser is preferably in the range of 10 mJ to 1000 mJ, more preferably in the range of 200 mJ to 600 mJ , The wavelength of the laser depends on the type of laser used and can be at an excimer laser at 193 nm, 248 nm, 308 nm or 351 nm, with a CO 2 laser at 10.6 microns or 9.4 microns, and with an Nd: YAG laser at 1064 nm, 946 nm, 1320 nm or 1444 nm.

Ist es beabsichtigt, eine Aufschmelzung des Substrats zu erzielen, so ist es erfindungsgemäß bevorzugt, im UV-Bereich bzw. im nahen IR-Bereich einzustrahlen, da insbesondere bei der Verwendung von Glas als Substrat eine Absorption in diesen Bereichen stattfinden kann, die zu einer Erwärmung führt. Im UV-Bereich sind Wellenlängen im Bereich von 150 nm bis 355 nm und im nahen IR-Bereich Wellenlängen von 5 µm bis 11 µm erfindungsgemäß bevorzugt.If it is intended to achieve melting of the substrate, it is preferred according to the invention to irradiate in the UV range or in the near IR range, since, in particular when glass is used as the substrate, absorption in these areas can take place Warming leads. In the UV range, wavelengths in the range of 150 nm to 355 nm and in the near IR range wavelengths of 5 μm to 11 μm are preferred according to the invention.

Das erfindungsgemäße Verfahren ermöglicht weiterhin aufgrund einer schnellen Energiemodulation durch Temperatureinflüsse die Variation der Farbzusammensetzung beziehungsweise der Farbwerte gemäß der sogenannten RAL-Farbtabelle.The inventive method further allows due to a rapid energy modulation by temperature effects, the variation of the color composition or the color values according to the so-called RAL color table.

Weiterhin kann in einem Digitaldrucksystem für Keramikfarben die Strahlungsquelle beziehungsweise der Laser für das Erwärmen der Keramikfarbe im Druckkopf integriert sein. Dabei können die zur Herstellung von Farben nach der RAL-Tabelle erforderlichen Keramikpigmente beziehungsweise Keramikfarben in einem Tanksystem bereitgestellt werden. Dabei wird vorzugsweise eine geeignete Steuerungselektronik zur "intelligenten" Farbmischung im Farbmanagementsystem verwendet.Furthermore, in a digital printing system for ceramic paints, the radiation source or the laser for heating the ceramic paint in the print head can be integrated be. In this case, the ceramic pigments or ceramic colors required for the production of colors according to the RAL table can be provided in a tank system. In this case, a suitable control electronics for "intelligent" color mixing in the color management system is preferably used.

Ein weiterer Gegenstand der vorliegenden Erfindung ist die Verwendung eines Laserstrahls beziehungsweise eines Lasers in einer Vorrichtung zum digitalen Drucken einer Keramikfarbe auf einem Substrat, wobei der Laserstrahl die Keramik der Keramikfarbe auf mindestens den Schmelzpunkt der Keramik simultan zu dem Aufbringen der Keramikfarbe auf ein Substrat mittels eines Druckkopfes zur Vorrichtung erwärmt.Another object of the present invention is the use of a laser beam or a laser in an apparatus for digitally printing a ceramic paint on a substrate, wherein the laser beam, the ceramic of the ceramic paint on at least the melting point of the ceramic simultaneously with the application of the ceramic paint to a substrate by means of a Printhead heated to the device.

Ein noch weiterer Gegenstand der vorliegenden Erfindung betrifft eine Vorrichtung zum digitalen Drucken einer Keramikfarbe auf einem Substrat, die einen Druckkopf zum Aufbringen einer Keramikfarbe auf ein Substrat sowie einen Laser zum Erwärmen der Keramik der Keramikfarbe auf mindestens den Schmelzpunkt der Keramik mittels eines Laserstrahls umfasst. In einer bevorzugten Variante der erfindungsgemäßen Vorrichtung weist diese einen ersten und einen zweiten Laser auf, die - wie weiter oben beschrieben - zur Einstrahlung des ersten und des zweiten Laserstrahls dienen können.Yet another object of the present invention is an apparatus for digitally printing a ceramic paint on a substrate comprising a printhead for applying a ceramic paint to a substrate and a laser for heating the ceramic of the ceramic paint to at least the melting point of the ceramic by means of a laser beam. In a preferred variant of the device according to the invention, this has a first and a second laser, which - as described above - can serve to irradiate the first and the second laser beam.

Alle für das erfindungsgemäße Verfahren bevorzugten Merkmale betreffen auch die erfindungsgemäße Verwendung beziehungsweise die erfindungsgemäße Vorrichtung.All features preferred for the method according to the invention also relate to the use according to the invention or the device according to the invention.

Das erfindungsgemäße Verfahren, die erfindungsgemäße Verwendung und die erfindungsgemäße Vorrichtung zum digitalen Drucken einer Keramikfarbe auf einem Substrat bringen die folgenden Vorteile mit sich:

  • Das simultane Aufschmelzen der Keramikpigmente der Keramikfarbe während des Druckvorgangs ermöglicht die Fertigstellung eines gedruckten Objekts mit Keramikfarben in viel geringerer Zeit, als wenn entsprechend bedruckte Substrate zur Aufschmelzung und Aushärtung der Keramikfarben in einem Vorspannofen behandelt werden müssen.
  • Die Verwendung eines Lasers zum Erwärmen beziehungsweise Aufschmelzen der Keramikpigmente der Keramikfarbe in einem fokussierten Punkt ermöglicht es, auch Keramikfarben zu verwenden, die eine höhere Schmelztemperatur als das Substrat besitzen. Entsprechende Keramikfarben können aufgrund der Temperaturbehandlung in einem Vorspannofen bisher nicht in Druckverfahren verwendet werden.
  • Durch die Möglichkeit der breiteren Verwendung von Keramikpigmenten ist es möglich, ein intelligentes Farbsystem bereitzustellen, das alle Farbtöne der RAL-Farbtabelle ermöglicht.
  • Gegenüber der Ink-Jet-Technologie (mit organischer Farbe und UV-Härtung) besitzt Keramikfarbe eine weitaus höhere Festigkeit, so dass der Digitaldruck von Keramikfarben einen sehr hohen Industriestandard erfüllt.
The method according to the invention, the use according to the invention and the device according to the invention for the digital printing of a ceramic paint on a substrate bring about the following advantages:
  • The simultaneous melting of the ceramic pigments of the ceramic paint during the printing process allows the completion of a printed object with ceramic paints in much less time than if appropriately printed substrates for melting and curing of the ceramic colors must be treated in a tempering furnace.
  • The use of a laser to heat or melt the ceramic pigments of the ceramic paint in a focused spot also makes it possible to use ceramic paints which have a higher melting temperature than the substrate. Corresponding ceramic paints can not be used in printing process due to the temperature treatment in a tempering furnace so far.
  • The possibility of broader use of ceramic pigments makes it possible to provide an intelligent color system that allows all shades of the RAL color chart.
  • In contrast to the inkjet technology (with organic color and UV curing), ceramic paint has a much higher strength, so that the digital printing of ceramic paints meets a very high industry standard.

Die vorliegende Erfindung soll nun schematisch anhand der Fig. 1 bis 6 erläutert werden. Sofern technisch realisierbar, können alle mit den einzelnen Ausführungsformen in den Fig. 1 bis 6 genannten bevorzugten Merkmale auch jeweils in den jeweils anderen Ausführungsformen verwendet werden, so dass die Nennung von bevorzugten Ausführungsformen in Verbindung mit einer bestimmten Figur keine Einschränkung auf die darin gezeigte Ausführungsform darstellt, sondern auch auf die in den anderen Figuren gezeigten Ausführungsformen übertragen werden kann.

Fig. 1:
Fig. 1 zeigt schematisch ein erfindungsgemäßes Verfahren mit Erwärmung von Keramikpigmenten mittels eines Laserstrahls.
Fig. 2:
Fig. 2 zeigt ein erfindungsgemäßes Verfahren, wobei das Aufschmelzen der Keramikpigmente der Keramikfarbe zeitgleich, aber nicht ortsgleich auf dem gleichen Substrat durchgeführt wird.
Fig. 3:
Fig. 3 zeigt ein erfindungsgemäßes Verfahren, worin der Laserstrahl von der dem Druckkopf gegenüberliegenden Seite des Substrats auf die Keramikpigmente der Keramikfarbe fokussiert wird.
Fig. 4:
Fig. 4 zeigt ein erfindungsgemäßes Verfahren, bei dem die Einstrahlung des Lasers zeit- und ortsgleich zu dem Aufbringen der Keramikpigmente auf dem Substrat erfolgt.
Fig. 5:
Die Fig. 5 zeigt ein erfindungsgemäßes Verfahren, bei dem der Laser in dem Druckkopf integriert ist.
Fig. 6:
Die Fig. 6 zeigt ein erfindungsgemäßes Verfahren, bei dem mit zwei verschiedenen Lasern eingestrahlt wird.
Fig. 7:
Die Fig. 7 zeigt ein Verfahren nach dem Stand der Technik, bei dem das Aushärten der Keramikfarbe in einem getrennten Vorspannofen stattfindet.
The present invention will now be described schematically with reference to FIGS Fig. 1 to 6 be explained. If technically feasible, all with the individual embodiments in the Fig. 1 to 6 mentioned preferred features are also used in the respective other embodiments, so that the mention of preferred embodiments in conjunction with a particular figure is not limiting to the embodiment shown therein, but can also be transferred to the embodiments shown in the other figures.
Fig. 1:
Fig. 1 schematically shows a method according to the invention with heating of ceramic pigments by means of a laser beam.
Fig. 2:
Fig. 2 shows a method according to the invention, wherein the melting of the ceramic pigments of the ceramic color is carried out at the same time, but not the same location on the same substrate.
3:
Fig. 3 shows a method according to the invention, wherein the laser beam is focused from the opposite side of the printhead of the substrate to the ceramic pigments of the ceramic paint.
4:
Fig. 4 shows a method according to the invention, in which the irradiation of the laser takes place at the same time and in place to the application of the ceramic pigments on the substrate.
Fig. 5:
The Fig. 5 shows a method according to the invention, in which the laser is integrated in the print head.
Fig. 6:
The Fig. 6 shows a method according to the invention, in which is irradiated with two different lasers.
Fig. 7:
The Fig. 7 shows a method of the prior art, in which the curing of the ceramic paint takes place in a separate tempering furnace.

In Fig. 1 wird schematisch gezeigt, wie auf ein Substrat 1 Keramikpigmente 3 einer Keramikfarbe 2 aufgebracht werden, die simultan mit einem Laserstrahl eines Lasers 4 behandelt werden, so dass die Pigmente schmelzen und durch anschließendes Wiederabkühlen ausgehärtet werden können.In Fig. 1 3 shows schematically how ceramic pigments 2 of a ceramic color 2 are applied to a substrate 1, which are treated simultaneously with a laser beam of a laser 4, so that the pigments can melt and be cured by subsequent cooling.

In Fig. 2 ist schematisch ein erfindungsgemäßes Verfahren gezeigt, bei dem auf ein Substrat 1 Keramikpigmente 3 einer Keramikfarbe 2 an einem bestimmten Ort auf das Substrat 1 aufgebracht werden. Das Erwärmen der aufgebrachten Keramikpigmente 3 erfolgt auf dem gleichen Substrat 1 zwar zeitgleich durch den Laserstrahl eines Lasers 4, jedoch nicht an der gleichen Stelle an der die Keramikfarbe 2 auf das Substrat 1 aufgebracht wird. Nach dem Abkühlen der auf Schmelztemperatur gebrachten Keramikpigmente kann eine bedruckte Fläche 5 auf dem Glassubstrat 1 entstehen.In Fig. 2 schematically, a method according to the invention is shown in which applied to a substrate 1 ceramic pigments 3 of a ceramic paint 2 at a certain location on the substrate 1. The heating of the applied ceramic pigments 3 takes place on the same substrate 1 at the same time by the laser beam of a laser 4, but not at the same point at which the ceramic paint 2 is applied to the substrate 1. After cooling the ceramic pigments brought to melting temperature, a printed surface 5 can be formed on the glass substrate 1.

Fig. 3 zeigt ein erfindungsgemäßes Verfahren, bei dem auf ein Substrat 1 von einer Seite Keramikpigmente 3 einer Keramikfarbe 2 aufgebracht werden. Von der anderen Seite des Substrats 1 erfolgt die Einstrahlung eines Laserstrahls durch einen dort angebrachten Laser 4. Dabei wird der Laserstrahl so fokussiert, dass sein Brennpunkt nicht in dem Substrat 1 ist, sondern erst an der Stelle, an der die Keramikpigmente 3 der Keramikfarbe 2 geschmolzen werden sollen. Wiederum durch Abkühlen der Keramikpigmente entsteht hier eine bedruckte Fläche 5 auf dem Substrat 1. Hier wird vorzugsweise ein Glassubstrat verwendet. Fig. 3 shows a method according to the invention, in which ceramic pigments 3 of a ceramic paint 2 are applied to a substrate 1 from one side. The laser beam is focused in such a way that its focal point is not in the substrate 1, but only at the point at which the ceramic pigments 3 of the ceramic paint 2 to be melted. Again through Cooling of the ceramic pigments produces here a printed surface 5 on the substrate 1. Here, a glass substrate is preferably used.

Fig. 4 zeigt ein erfindungsgemäßes Verfahren, bei dem auf einem Substrat 1 Keramikpigmente 3 einer Keramikfarbe 2 aufgebracht werden, die direkt an der Stelle, an der sie auf dem Druckkopf aufgebracht werden, durch den Laserstrahl eines Lasers 4 geschmolzen werden. Durch Abkühlen der Keramikpigmente 3 auf dem Substrat 1 entsteht eine bedruckte Fläche 5. Fig. 4 shows a method according to the invention, in which on a substrate 1 ceramic pigments 3 of a ceramic paint 2 are applied, which are melted directly at the point where they are applied to the print head by the laser beam of a laser 4. By cooling the ceramic pigments 3 on the substrate 1, a printed surface 5 is formed.

Fig. 5 zeigt schematisch ein erfindungsgemäßes Verfahren, bei dem der Laser 4 in dem Druckkopf des Digitaldruckgerätes integriert ist, so dass die Keramikpigmente 3 der Keramikfarbe 2 während dem Auftragen auf das Substrat 1 auf ihre Schmelztemperatur erwärmt werden. Wiederum durch Abkühlen der Keramikpigmente 3 entsteht eine bedruckte Fläche 5 auf dem Substrat 1. Fig. 5 schematically shows a method according to the invention, in which the laser 4 is integrated in the printhead of the digital printing device, so that the ceramic pigments 3 of the ceramic paint 2 are heated to their melting temperature during application to the substrate 1. Again, by cooling the ceramic pigments 3, a printed surface 5 is formed on the substrate 1.

Fig. 6 zeigt schematisch ein erfindungsgemäßes Verfahren, bei dem mit zwei verschiedenen Lasern 4 eingestrahlt wird. Der erste Laser 4 wird vorzugsweise dafür verwendet, die Keramik 3 in der Keramikfarbe 2 zu schmelzen. Dieser Laser befindet sich vorzugsweise auf der Seite, von der auch die Keramikfarbe 2 auf das Substrat 1 aufgebracht wird. Der zweite Laser 4 wird vorzugsweise dafür verwendet, das Substrat 1 an der Oberfläche aufzuschmelzen, an der die Keramikfarbe 2 aufgebracht wird. Der zuletzt genannte Laser 4 strahlt vorzugsweise von der Seite ein, die der Seite gegenüberliegt, von der die Keramikfarbe 2 aufgebracht wird. Fig. 6 schematically shows a method according to the invention, in which two different lasers 4 are irradiated. The first laser 4 is preferably used to melt the ceramic 3 in the ceramic paint 2. This laser is preferably located on the side from which the ceramic paint 2 is applied to the substrate 1. The second laser 4 is preferably used to melt the substrate 1 on the surface at which the ceramic paint 2 is applied. The latter laser 4 preferably radiates from the side opposite to the side from which the ceramic paint 2 is applied.

Im Vergleich zu dem erfindungsgemäßen Verfahren ist in Fig. 7 ein Verfahren nach dem Stand der Technik dargestellt, bei dem ein Substrat 1 zunächst mit Keramikpigmenten 3 bedruckt wird und erst nach dem Druckvorgang das Aufschmelzen und Aushärten der Keramikpigmente 3 in einem Vorspannofen 6 erfolgt. Erst nach dem Herausnehmen des bedruckten Substrats 1 aus dem Vorspannofen 6 erlaubt das Abkühlen der geschmolzenen Keramikpigmente die Bildung einer bedruckten Fläche 5.Compared to the method according to the invention is in Fig. 7 a method according to the prior art shown in which a substrate 1 is first printed with ceramic pigments 3 and only after the printing process, the melting and curing of the ceramic pigments 3 takes place in a tempering furnace 6. Only after the removal of the printed substrate 1 from the tempering furnace 6 does the cooling of the molten ceramic pigments allow the formation of a printed surface 5.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
Substratsubstratum
22
Keramikfarbeceramic Color
33
Keramikpigmente/KeramikCeramic pigments / ceramics
44
Laserlaser
55
Bedruckte FlächePrinted area
66
Vorspannofentempering furnace

Claims (15)

Verfahren zum digitalen Drucken einer Keramikfarbe (2) auf einem Substrat (1), das die folgenden Schritte umfasst: (a) Aufbringen einer Keramikfarbe (2) auf ein Substrat (1) mittels eines Druckkopfes eines Digitaldruckgerätes; und (b) Erwärmen der Keramik (3) der Keramikfarbe (2) auf mindestens den Schmelzpunkt der Keramik (3) mittels eines Laserstrahls eines Lasers (4), dadurch gekennzeichnet, dass
der Schritt (b) simultan zu dem Schritt (a) stattfindet.
A method of digitally printing a ceramic paint (2) on a substrate (1), comprising the steps of: (A) applying a ceramic paint (2) on a substrate (1) by means of a print head of a digital printing device; and (b) heating the ceramic (3) of the ceramic paint (2) to at least the melting point of the ceramic (3) by means of a laser beam of a laser (4), characterized in that
the step (b) takes place simultaneously with the step (a).
Verfahren nach Anspruch 1, worin das Substrat (1) ein Glas-, Metall- oder Keramiksubstrat ist.The method of claim 1, wherein the substrate (1) is a glass, metal or ceramic substrate. Verfahren nach Anspruch 1 oder 2, wobei die Keramikfarbe (2) Keramikpigmente (3) enthält.A method according to claim 1 or 2, wherein the ceramic paint (2) contains ceramic pigments (3). Verfahren nach einem der Ansprüche 1 bis 3, worin in Schritt (b) die Keramik der Keramikfarbe (2) auf Temperaturen im Bereich von 600 °C bis 3200 °C erwärmt wird.A method according to any one of claims 1 to 3, wherein in step (b) the ceramic of the ceramic paint (2) is heated to temperatures in the range of 600 ° C to 3200 ° C. Verfahren nach einem der Ansprüche 1 bis 4, worin das Erwärmen der Keramik der Keramikfarbe (2) mittels eines Laserstrahls durchgeführt wird, der die Keramik der aufgebrachten Keramikfarbe (2) auf dem Substrat (1) in einem Punkt fokussiert erwärmt.A method according to any one of claims 1 to 4, wherein the heating of the ceramic of the ceramic paint (2) is performed by means of a laser beam which heats the ceramic of the applied ceramic paint (2) focused on the substrate (1) at a point. Verfahren nach Anspruch 5, worin das in einem Punkt fokussierte Erwärmen mit einer Zeitdauer im Bereich von 100 fs bis 1 µs stattfindet.The method of claim 5, wherein the focused heating in a point takes place in the range of 100 fs to 1 μs. Verfahren nach Anspruch 5 oder 6, worin der Punkt einen Durchmesser im Bereich von 0,1 µm bis 15 mm aufweist.A method according to claim 5 or 6, wherein the point has a diameter in the range from 0.1 μm to 15 mm. Verfahren nach einem der Ansprüche 1 bis 6, worin das Erwärmen der Keramik der Keramikfarbe (2) mittels eines Laserstrahls durch pulsierte Lasereinstrahlung stattfindet.Method according to one of claims 1 to 6, wherein the heating of the ceramic of the ceramic paint (2) by means of a laser beam by pulsed laser irradiation takes place. Verfahren nach Anspruch 8, worin der Puls der Lasereinstrahlung im Bereich von 0,5 ps bis 10 ns liegt.The method of claim 8, wherein the laser irradiation pulse is in the range of 0.5 ps to 10 ns. Verfahren nach einem der Ansprüche 1 bis 9, worin mit einem ersten Laserstrahl das Erwärmen der Keramik und mit einem zweiten Laserstrahl ein Aufschmelzen der Oberfläche des Substrats erfolgt.Method according to one of claims 1 to 9, wherein the heating of the ceramic takes place with a first laser beam and a melting of the surface of the substrate with a second laser beam. Verfahren nach einem der Ansprüche 1 bis 9, worin das Erwärmen der Keramik der Keramikfarbe (2) mittels eines Laserstrahls durchgeführt wird, der von der gleichen Seite des Substrats (1) einstrahlt, auf der die Keramikfarbe (2) aufgebracht wird, oder mittels eines Laserstrahls durchgeführt wird, der von der Seite des Substrats (1) einstrahlt, die der Seite gegenüberliegt, auf der die Keramikfarbe (2) aufgebracht wird.Method according to one of claims 1 to 9, wherein the heating of the ceramic of the ceramic paint (2) is carried out by means of a laser beam irradiated from the same side of the substrate (1) on which the ceramic paint (2) is applied, or by means of a Laser beam is irradiated, which irradiates from the side of the substrate (1), which is opposite to the side on which the ceramic paint (2) is applied. Verfahren nach Anspruch 10, worin der erste Laserstrahl von der gleichen Seite des Substrats (1) einstrahlt, auf der die Keramikfarbe (2) aufgebracht wird, und der zweite Laserstrahl von der Seite des Substrats (1) einstrahlt, die der Seite gegenüberliegt, auf der die Keramikfarbe (2) aufgebracht wird.A method according to claim 10, wherein the first laser beam irradiates from the same side of the substrate (1) on which the ceramic paint (2) is applied, and the second laser beam irradiates from the side of the substrate (1) facing the side the ceramic paint (2) is applied. Verfahren nach einem der Ansprüche 1 bis 12, worin der Schritt (b) simultan zu dem Schritt (a) an der gleichen oder einer anderen Stelle des Substrats (1) durchgeführt wird.A method according to any one of claims 1 to 12, wherein step (b) is performed simultaneously with step (a) at the same or different location of the substrate (1). Verwendung eines Laserstrahls in einer Vorrichtung zum digitalen Drucken einer Keramikfarbe (2) auf einem Substrat (1), wobei der Laserstrahl eines Lasers (4) die Keramik (3) der Keramikfarbe (2) auf mindestens den Schmelzpunkt der Keramik simultan zu dem Aufbringen der Keramikfarbe auf ein Substrat mittels eines Druckkopfes der Vorrichtung erwärmt.Use of a laser beam in a device for digital printing of a ceramic paint (2) on a substrate (1), wherein the laser beam of a laser (4) the ceramic (3) of the ceramic paint (2) at least the melting point of the ceramic simultaneously to the application of Ceramic paint is heated on a substrate by means of a print head of the device. Vorrichtung zum digitalen Drucken einer Keramikfarbe (2) auf einem Substrat (1), die einen Druckkopf zum Aufbringen einer Keramikfarbe (2) auf ein Substrat (1) sowie einen Laser (4) zum Erwärmen der Keramik der Keramikfarbe auf mindestens den Schmelzpunkt der Keramik mittels eines Laserstrahls umfasst.Apparatus for digitally printing a ceramic paint (2) on a substrate (1) comprising a print head for applying a ceramic paint (2) to a substrate (1) and a laser (4) for heating the ceramic of the ceramic paint to at least the melting point of the ceramic by means of a laser beam.
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EP0768343A2 (en) 1995-10-14 1997-04-16 BASF Aktiengesellschaft Brilliant goniochromatic pigments with a silicon containing coating
EP1371496A2 (en) * 2002-06-14 2003-12-17 Schott Glas Glass or ceramic article with printed image
EP2436527A2 (en) * 2010-06-14 2012-04-04 Tecglass SL Machine and method for digital ink-jet glass printing with simultaneous drying
WO2015023612A2 (en) * 2013-08-15 2015-02-19 Oxane Materials, Inc. Additive fabrication of proppants

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DE102004049955B4 (en) * 2004-10-13 2008-12-04 Schott Ag Method for producing an optical component, in particular an OLED

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0768343A2 (en) 1995-10-14 1997-04-16 BASF Aktiengesellschaft Brilliant goniochromatic pigments with a silicon containing coating
EP1371496A2 (en) * 2002-06-14 2003-12-17 Schott Glas Glass or ceramic article with printed image
EP2436527A2 (en) * 2010-06-14 2012-04-04 Tecglass SL Machine and method for digital ink-jet glass printing with simultaneous drying
WO2015023612A2 (en) * 2013-08-15 2015-02-19 Oxane Materials, Inc. Additive fabrication of proppants

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